d+2d=-3=6

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Solution for d+2d=-3=6 equation: 



d+2d=-3=6

We move all terms to the left:

d+2d-(-3)=0

We add all the numbers together, and all the variables

3d+3=0

We move all terms containing d to the left, all other terms to the right

3d=-3

d=-3/3

d=-1

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